The answer to 'best time for mulch' is that the best time to apply mulch in your landscaping is in the spring, typically between March and May. This is the ideal time because it helps retain moisture in the soil during the hot summer months, suppresses weed growth, and insulates plant roots from temperature extremes.
Applying a 2-4 inch layer of organic mulch, such as wood chips, shredded bark, or leaves, around your plants, trees, and shrubs will provide these benefits. Be sure to keep the mulch a few inches away from the base of plants to prevent rot. Reapplying mulch annually or as needed will help maintain the protective layer and keep your landscaping looking neat and tidy.